Answer: Cellulose
Cellulose is referred as insoluble fiber on food packages. Insoluble fiber lacks solubility in water but have passive water-attracting properties that augment to increase bulk and moisture of the stool. The water-holding quality of cellulose shorten the transit time of food to pass through the stomach and intestinal tract. Moreover, cellulose is mostly made up from the structural component of cell walls in green plants and vegetables.
